|
|
Atari coding BBS
| Re: DSP extern memory extra cycles |
|---|
|
Posted by: Patrice Mandin
|
Jan,04.2012-22:57
|
As far as I know (but maybe I'm wrong), each external access cost 1 cycle. i.e. for a MAC using X: and Y: external memory, you add 2 cycles (1 for X: 1 for Y:), compared to a MAC using X: and Y: internal memory.
Of course, the same when you have a program (or subroutine) in external memory. Fetching each word of instruction cost 1 cycle to access external P: data. So the same MAC instruction (3 words if I remember correctly) = 3 cycles more.
|
[All messages in this thread] [Start new thread]
What's the anti-troll code?
That's your personal code to be able to add comments and messages on the dhs.nu site.
Don't have a code or forgot it? Fix it here.
|
